Toyota Pick-ups/Land Cruiser/4Runner 1989-1996

Speed Sensor

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SYSTEM TEST



The following procedures require driving the vehicle while it is in the diagnostic mode. The anti-lock system will be disabled; only normal braking function will be available.

  1. If working on a 4WD vehicle, make certain it is only in 2WD. Check the battery voltage with the engine OFF ; voltage should be approximately 12 volts.
  2.  
  3. With the ignition switch ON , make certain the ABS warning lamp comes on for about 3 seconds and then goes out. Turn the ignition switch OFF .
  4.  
  5. Using a 3-way jumper, connect terminals Tc, Ts and E1 at the Data Link Connector (DLC1).
  6.  
  7. Pull the parking brake on securely and start the motor without stepping on the brake pedal. Depressing the brake pedal will either void the test or cause the system to enter a different diagnostic mode.
  8.  
  9. The dashboard warning lamp should flash evenly about 4 times per second. If, instead, a code is flashed, repairs must be made and the code(s) cleared before continuing. If the light does not flash, check the parking brake switch, the DLC1 connector and the wiring to the ABS controller.
  10.  
  11. To check the sensor signal level, release the parking brake and drive the vehicle straight ahead at low speed. Once a speed of 2-5 mph (3-8 km) is reached, the warning lamp should turn off. Once the light has gone off, it should begin to blink as the vehicle leaves the speed range. This blinking is normal and indicates the speed sensor is operating correctly. If no blinking occurs, the system is defective.
  12.  
  13. Check the sensor signal change by driving the vehicle on the road. Once a speed of 25-31 mph (40-50 km) is achieved, the warning lamp should come on after a one second pause. As before, the lamp should blink evenly as the vehicle leaves the speed range; failure to blink indicates a system fault.
  14.  

While the warning lamp is off, do not subject the vehicle to any shocks or impact such as shifting, acceleration, deceleration or road impact.

  1. Stop the vehicle in a safe location and apply the parking brake fully. Read and record any stored codes which are displayed.
  2.  
  3. Turn the ignition switch OFF ; remove the jumper wire from the DLC1 connector.
  4.  

COMPONENT TEST

Front Sensor

See Figures 1, 2, 3, 4 and 5

  1. Unplug the speed sensor connector.
  2.  



Click image to see an enlarged view

Fig. Fig. 1: Unplug the speed sensor connection

  1. Measure the resistance between terminals 1 (FL-) and 2 (FL+). The resistance should be as follows:

    4Runner-1.4-1.8k ohms
     
    T100-0.6-1.8k ohms
     
    Land Cruiser-0.97-1.77k ohms
     

  2.  
  3. If the resistance is not as specified, replace the sensor.
  4.  



Click image to see an enlarged view

Fig. Fig. 2: Sensor terminal locations

  1. Check that there is no continuity between each terminal and the sensor body. If there is continuity, replace the sensor.
  2.  



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Fig. Fig. 3: Using an ohmmeter, check for continuity between the sensor and the terminals

  1. Attach the speed sensor harness.
  2.  



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Fig. Fig. 4: The sensor is secured by a single bolt

  1. Check the installation of the sensor. If the mounting bolt is loose, tighten it to 69 inch lbs. (8 Nm).
  2.  



Click image to see an enlarged view

Fig. Fig. 5: Check the sensor rotor for any damage. Replace if necessary

  1. Remove the axle hub with the rotor. Inspect the sensor rotor serrations for scratches, cracks, warping or missing teeth. Replace if necessary.
  2.  

To prevent from damaging the serrations, do not strike the axle hub with the rotor.

  1. Reconnect the speed sensor to the harness.
  2.  

Rear Sensor

See Figures 6, 7, 8 and 9

  1. Unplug the speed sensor connector.
  2.  



Click image to see an enlarged view

Fig. Fig. 6: Unplug the harness leading to the rear sensor

  1. Measure the resistance between the terminal 1 (RL-) and 2 (RL+). The is 1 is (RR-) and 2 is (RR+) resistance should be as follows:

    T100-0.6-2.05k ohms
     
    Land Cruiser-0.5-1.6k ohms
     
    4Runner-1.0-1.4k ohms
     

  2.  
  3. If the resistance is not as specified, replace the sensor.
  4.  



Click image to see an enlarged view

Fig. Fig. 7: The rear sensor terminal pins

  1. Check that there is no continuity between each terminal and the sensor body. If there is continuity, replace the sensor.
  2.  



Click image to see an enlarged view

Fig. Fig. 8: Using an ohmmeter, check for continuity on the sensor

  1. Attach the speed sensor harness.
  2.  
  3. Check the installation of the sensor. If the mounting bolt is loose, tighten it to 69 inch lbs. (8 Nm).
  4.  



Click image to see an enlarged view

Fig. Fig. 9: Check the sensor rotor for any damage. Replace if necessary

  1. Remove the axle hub with the rotor. Inspect the sensor rotor serrations for scratches, cracks, warping or missing teeth.
  2.  

To prevent from damaging the serrations, do not strike the axle hub with the rotor.

REMOVAL & INSTALLATION



Front

See Figures 10 and 11

  1. Unplug the speed sensor harness to the unit.
  2.  
  3. On 4WD vehicles, remove the clamp bolts and clips holding the sensor harness from the frame, upper arm and steering knuckle.
  4.  



Click image to see an enlarged view

Fig. Fig. 10: Exploded view of the front speed sensor mounting and harness routing-T100 shown



Click image to see an enlarged view

Fig. Fig. 11: Front speed sensor mounting harness routing-Land Cruiser shown

  1. On 2WD vehicles, remove the clamp bolts and clips holding the sensor harness to the frame and upper arm.
  2.  

Discard the old clips.

  1. Remove the sensor from the knuckle.
  2.  

To install:
  1. Attach the sensor to the steering knuckle, tighten to 69-71 inch lbs. (7-8 Nm).
  2.  
  3. Attach the harness along the upper arm and frame with new clips. Tighten the mounting bolts to 48-71 inch lbs. (5-8 Nm).
  4.  
  5. Engage the sensor harness to the unit.
  6.  

Rear

See Figures 12 and 13

  1. Unplug the speed sensor harness to the unit.
  2.  
  3. Remove the clamp bolts and nuts holding the sensor harness from the frame, upper arm, axle housing and fuel tank (if attached).
  4.  



Click image to see an enlarged view

Fig. Fig. 12: The rear speed sensor is mounted along the rear axle-T100



Click image to see an enlarged view

Fig. Fig. 13: The rear speed sensor is mounted along the rear axle-Land Cruiser

Discard the old clips.

  1. Remove the sensor from the axle.
  2.  

To install:
  1. Attach the sensor to the axle, tighten to 69-71 inch lbs. (7-8 Nm).
  2.  
  3. Attach the harness along the appropriate areas, then tighten the mounting bolts to 48-71 inch lbs. (5-8 Nm). Be sure to used all new clips, and install them in the same angle of the removed ones.
  4.  
  5. Engage the sensor harness to the unit.
  6.  

 
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